Table 1-12 Time Required For Charges Of Main Battery; Table 1-13 Data Preservation Time; Battery Charging Control - Toshiba PORTEGE M400 Maintenance Manual

1 Hardware Overview

1.7.2 Battery Charging Control

Battery charging is controlled by a power supply microprocessor. The power supply
microprocessor controls power supply and detects a full charge when the AC adapter and
battery are connected to the computer.
Quick Battery Charge
When the AC adapter is connected, normal charging is used while the system is
turned on and quick charge is used while the system is turned off or in standby mode.
Table 1-12 lists the main battery charging time.

Table 1-12 Time required for charges of main battery

Battery Capacity
Main (4700mAh)
Second (4000mAh)
Quick battery charge is stopped in the following cases.
1. The main battery is fully charged.
2. The main battery is removed.
3. Main battery or AC adapter voltage is abnormal.
4. Charging current is abnormal.
Data preservation time
When turning off the power in being charged fully, the preservation time is as
following Table 1-13.
Main (4700mAh)
Second (4000mAh)
1-26 [CONFIDENTIAL]
Normal charge
about 3.0 to 13.0
about 3.0 to 10.5

Table 1-13 Data preservation time

Condition
Standby mode
Boot mode
Standby mode
Boot mode
Charging Time
Quick charge
about 3.0
about 3.0
preservation time
About 6 days
About 70 days
About 5 days
About 60 days
PORTEGE M400 Maintenance Manual (960-541)
1.7 Batteries